Write the conversation response. 
 + What were the main ships of the Austro-Hungarian Navy?
 + The two Germaniawerft submarines comprised the "U-3" class.
 + When was the Navy formed?
 + The Navy authorized two boats, "U-3" and "U-4", from the Germaniawerft in 1906.
 + Are there any other interesting aspects about this article?
 + The "U-3"-class was an improved version of Germaniawerft's design for the Imperial German Navy's first U-boat, , and featured a double hull with internal saddle tanks.
 + Did they have any problems with the design?
 + The Germaniawerft engineers refined the design's hull shape through extensive model trials.
 + Did they work with any other designers?
 + 
The was built to the same design as the C-class for the US Navy and was built by Robert Whitehead's firm of Whitehead & Co.